September in Giresun averages a daily high of 24.5°C with nights around 19°C. Expect roughly 12.9 wet days totalling 161.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Giresun is May–October.
Based on GIRESUN, TU (0.4km), 1995–2024. 15 years of September data.